Heavy Truck Tire Sipe Geometry for Crack-Resistant Tread Wear
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Solution Overview
Problem
Existing tire sipes, particularly in heavy truck tires, cause irregular wear, increased rolling resistance, and cracking due to stress concentration, while attempts to mitigate cracking through larger teardrop sizes or moving the teardrop closer to the upper surface compromise traction and rigidity.
Innovation Solution
A sipe design with a teardrop shape where the middle section is farther from the upper surface than the ends, featuring geometric transitions that reduce crack propagation without altering the overall depth or cross-sectional size, maintaining rigidity and traction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the teardrop size is increased to prevent cracking at the bottom of the teardrop, then end of service traction is improved, but rigidity in the tread block decreases and wear performance deteriorates
Solution Approach 1:
The sipe features a teardrop shape with non-uniform depth where the middle section extends deeper into the tread block than the ends. This local variation in geometry concentrates the crack-prevention effect at the critical middle section while preserving rigidity in the end sections that contact the road surface.
2Reliability
If the teardrop is moved closer to the upper surface of the tread to reduce cracking, then sipe depth is reduced, but end of service traction decreases
Solution Approach 1:
Instead of moving the teardrop horizontally closer to the upper surface, the invention varies the depth in the radial dimension, creating a teardrop shape where the middle section extends deeper than the ends. This dimensional variation maintains both crack prevention and traction.
3Object-generated harmful factors
If sipes are added to improve traction in snow, mud, and ice, then tire performance in these conditions is improved, but irregular wear and rolling resistance increase
Solution Approach 1:
The sipe geometry is optimized by varying the depth parameter along its length, creating a teardrop shape with the middle section extending deeper than the ends. This parameter variation reduces stress concentration and minimizes the negative impacts on wear and rolling resistance while maintaining traction benefits.
Data Source
AI summary
A heavy truck tire tread that has a rib is provided. A sipe is in the rib that extends from a first lateral surface to a second lateral surface. A first end of a teardrop is located at the first lateral surface, and a second end at the second lateral surface. A middle section of the teardrop is located between the first and second ends in the lateral direction. A first transition is located between the first end and the middle section, and a second transition is located between the second end and the middle section and they both extend in the lateral and thickness directions. The entire middle section is farther from the upper surface in the thickness direction than any portion of the first or second ends are to the upper surface in the thickness direction.